International Gold Number
The international gold number (IGN) is a measure of the stability of a colloidal solution. It is defined as the number of milligrams of gold per liter of solution that is required to cause the precipitation of the colloid. The higher the IGN, the more stable the colloid.
The IGN is an important parameter in the characterization of colloidal solutions because it can be used to predict the shelf life and performance of the colloid. A colloid with a high IGN is more likely to be stable and resistant to coagulation than a colloid with a low IGN.
The IGN can be determined by a variety of methods, including the Turkevich method, the Frens method, and the Zsigmondy method. The Turkevich method is the most commonly used method for determining the IGN.
The Turkevich method involves adding a known amount of gold chloride solution to a colloidal solution and then measuring the absorbance of the solution at a wavelength of 520 nm. The absorbance is then plotted against the concentration of gold chloride solution, and the IGN is determined from the slope of the plot.
The IGN is a valuable parameter for understanding the behavior of colloidal solutions. It can be used to predict the stability of a colloid, to compare the stability of different colloids, and to optimize the formulation of colloidal solutions.
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